Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef7e71e64e01657…

MALICIOUS

PDF

82.3 KB Created: 2021-04-04 00:12:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: ee54883cc711996105a4ed47e96b5ec1 SHA-1: d2da1881085d2a91a7581439acacf4dea1371f91 SHA-256: 4ef7e71e64e016576de046310b4344cef74ff6e025ff626bb7399ecaf9329c2e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one pointing to 'bologen.ru' and another to a link farm on disposable hosting. The document body, though heavily obfuscated, suggests a lure related to interview questions, aligning with phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://bologen.ru/123?utm_term=best+sample+answers+for+interview+questions PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383475/normal_603976d47d579.pdfIn PDF document text
    • https://cdn.sqhk.co/bojodunaluko/ihjemLQ/buzino.pdfIn PDF document text
    • https://cdn.sqhk.co/vuluzazogur/ggnIjhY/7776798838.pdfIn PDF document text
    • https://cdn.sqhk.co/lizuloka/ggajcEn/17._5_vat_calculator_formula.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473637/normal_5fcd53f98ecc1.pdfIn PDF document text
    • http://fazaziratizedup.22web.org/calendario_serie_a_formato.pdfIn PDF document text
    • http://wow50.pro/how_to_reset_my_printer_to_onlinergsz6.pdfIn PDF document text
    • http://copyright-help-center.com/how_to_install_graco_travel_system_car_seat8s8gq.pdfIn PDF document text
    • http://hihikane.space/54802427206dqvtq.pdfIn PDF document text
    • https://cdn.sqhk.co/dafisuwikib/chigekg/optical_illusions_san_mateo_ca.pdfIn PDF document text
    • https://cdn.sqhk.co/josedinis/y1icjbs/electrical_service_load_calculation_worksheet_multi_family.pdfIn PDF document text
    • https://cdn.sqhk.co/tuzevawu/eGxheic/harris_federation_jobs_login.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487888/normal_6068d80ad67fe.pdfIn PDF document text
    • https://cdn.sqhk.co/pemejurove/ghAmagj/20842794332.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://voveganodamamuf.rf.gd/when_was_the_last_kenmore_sewing_machine_made.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fa335625-8ce0-4e53-a8fc-a864599ee09a/wd_my_cloud_home_duo_8tb.pdfIn PDF document text
    • http://jajiwolid.epizy.com/gcse_english_language_aqa_revision.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a2c8f54-c5ae-4815-9416-0d67fa8411e5/wawogilo.pdfIn PDF document text
    • http://dimaxufa.rf.gd/demonstrative_pronouns_worksheet_grade_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12131325-5812-4c56-9a23-f3ff6340b39a/hp_deskjet_6940_not_printing_black_ink.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/54861be0-1b20-4223-910c-c39ba0827428/patulukaligu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F2 5256 bytes
SHA-256: 135c3531a77067a17c3ea8a83d522e1ed70b87cd2e28e2368fbae887899a28b8
font_01_sfnt_off00010ad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AD6 10600 bytes
SHA-256: 33ac2ddf6a2ffe709a21107c5d3c9af3099bdb322f70284840b801fd717abc86
font_02_sfnt_off00012eda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EDA 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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